Daily availability of nutrients and metals in a eutrophic meso-tidal coastal lagoon (Óbidos lagoon, Portugal)

Patrícia Pereira*, Hilda de Pablo, Susana Carvalho, Carlos Vale, Mário Pacheco

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

This baseline reports daily variations of physico-chemical parameters, nutrients and metals in water of two sites [eutrophic conditions (BB) versus reference (LL)] in Óbidos coastal lagoon (Portugal). Dissolved oxygen in BB varied between 40% saturation levels (night) and 190% (daylight). NH4+, PO43- and ratios to Al of Mn, Fe and Pb in suspended particulate matter increased during the period of lower oxygenation, indicating exportation of nutrients and metals from the sediment to water at night. At LL, O2 values oscillated always around 100%. PO43- and Mn/Al ratio at LL were always lower than at BB and no increases were found during the night. The input of PO43- and Mn provided from the sediment at BB during the night could surpass the contribution of freshwater discharges. PCA confirmed the separation of most samples from BB and LL. These results pointed to the importance of assessing chemical conditions over day-night cycles.

Original languageEnglish (US)
Pages (from-to)1868-1872
Number of pages5
JournalMarine Pollution Bulletin
Volume60
Issue number10
DOIs
StatePublished - Oct 1 2010

Keywords

  • Day-night cycles
  • Environmental health assessment
  • Eutrophication
  • Metals
  • Nutrients
  • Óbidos lagoon

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science
  • Pollution

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